Biodegradable resin composition and biodegradable molded article comprising same

Abstract

The present invention relates to a biodegradable resin composition and a biodegradable molded article comprising same. The biodegradable resin composition comprises: a biodegradable resin; an inorganic filler; and at least one selected from the group consisting of iron, magnesium, manganese, and calcium, wherein the amount of the inorganic filler is at least 30 wt % based on the total weight of the biodegradable resin composition.

1 . A biodegradable resin composition, comprising:
 a biodegradable resin;   an inorganic filler; and   one or more selected from the group consisting of iron, magnesium, manganese and calcium,   wherein a content of the inorganic filler is 30 wt % or more based on a total weight of the biodegradable resin composition.   
     
     
         2 . The biodegradable resin composition according to  claim 1 , wherein the biodegradable resin composition further comprises one or more selected from the group consisting of aluminum, cobalt, potassium, sodium, and phosphorus. 
     
     
         3 . The biodegradable resin composition according to  claim 1 , wherein a content of the iron is 1 ppm to 200 ppm based on the total weight of the biodegradable resin composition. 
     
     
         4 . The biodegradable resin composition according to  claim 1 , wherein a content of the magnesium is 100 ppm or more based on the total weight of the biodegradable resin composition. 
     
     
         5 . The biodegradable resin composition according to  claim 1 , wherein a content of the manganese is 3 ppm or more based on the total weight of the biodegradable resin composition. 
     
     
         6 . The biodegradable resin composition according to  claim 1 , wherein a content of the calcium is 1×10 5  ppm or more based on the total weight of the biodegradable resin composition. 
     
     
         7 . The biodegradable resin composition according to  claim 1 , wherein a content of the cadmium in the biodegradable resin composition is less than 1 ppm based on the total weight of the biodegradable resin composition. 
     
     
         8 . A biodegradable resin composition, comprising:
 a biodegradable resin;   an inorganic filler;   a metal salt; and   an anti-hydrolysis agent,   wherein a content of the inorganic filler is 30 wt % or more based on the total weight of the biodegradable resin composition.   
     
     
         9 . The biodegradable resin composition according to  claim 8 , wherein the metal salt comprises iron. 
     
     
         10 . The biodegradable resin composition according to  claim 8 , wherein the anti-hydrolysis agent comprises silicon. 
     
     
         11 . The biodegradable resin composition according to  claim 10 , wherein a content of the silicon is 1 ppm to 300 ppm based on a total weight of the biodegradable resin composition. 
     
     
         12 . The biodegradable resin composition according to  claim 8 , wherein a hydrolysis degree after 1 week of the biodegradable resin composition is 35% to 60%, a hydrolysis degree after 3 weeks thereof is 85% or more, and the hydrolysis degree after 1 week and the hydrolysis degree after 3 weeks are measured by Measurement Method 1 below:
 [Measurement Method 1]   The hydrolysis degree after 1 week is a reduction rate compared to an initial number average molecular weight of the biodegradable resin composition when the biodegradable resin composition is placed for 1 week under high-temperature and high-humidity conditions of 80° C. and 100% humidity, and   the hydrolysis degree after 3 weeks is a reduction rate compared to the initial number average molecular weight of the biodegradable resin composition when the biodegradable resin composition is placed for 3 weeks under high-temperature and high-humidity conditions of 80° C. and 100% humidity.   
     
     
         13 . A biodegradable molded article, comprising:
 a biodegradable resin;   an inorganic filler; and   one or more selected from the group consisting of iron, magnesium, manganese and calcium,   wherein a content of the inorganic filler is 30 wt % or more based on a total weight of the biodegradable resin composition.   
     
     
         14 . The biodegradable molded article according to  claim 13 , wherein the biodegradable molded article is a soil fertilization material. 
     
     
         15 . A biodegradable molded article, comprising:
 a biodegradable resin;   an inorganic filler;   a metal salt; and   an anti-hydrolysis agent,   wherein a content of the inorganic filler is 30 wt % or more based on a total weight of the biodegradable resin composition.